Boring tool



April 16, 1940. s, SM1-m 2,197,162

BORING Toor.

Filed Jan. 26, 1959 INVENTOR. LUC/AN S. ,SM1 TH ATTORNEYS.

y3() Fig. 10 is a sectional View rtaken along the line v angle of slot 39.

litel'nedApi?.16,.1,940 y Y e I l 2,197,152. -K

UNITED STATES PATENT OFFICE BORING Toor. Lucian s. smith, Los Angeles, Calif. y Appia-ationV January 26, 1939, serial No. 252,978

1 claim. (o1. 'x7-5s) This invention relates to machine tools and when the lock screw I'I is screwed down, shoulder more especially to boring tools for lathes. 2D will press against bit 2|, which in turn willl Anl object of this invention is to provide a press against ange 23, which in turn will be simple,practical and eiicient tool of the characpressed and held against seat I4, andthe aster described. sembly will be tightly held together for the bor- Another object is to provide' an inexpensive ing operations.l v, 'l boring tool adaptedfor4 cutting small diameters In Figs'. 4 to 8 I show a modified form of the and having replaceable bits securely held therein. invention which vcomprises a tubular shank 24,

Other objects and advantages will appear and having a bore 25 provided with' anangular aperbe brought out more fully in the following speciture 26, which aperture has abutment portions 10 fication, reference being; had to the accompany- 21 for Aa toolbit 28. A lock rod29 adapted to ing drawing, wherein i y fit bore 25 is provided with a threaded portion 3U Fig'. lis a bottom view partly broken away, of for alock screw 3|, having apertures 3,2 for a an embodiment of my invention. radial tightening tool." f v Fig.l2 is a sectional view taken along the line Rod 29 is provided with a recess 33`having an 15 2-2 of Fig. 1. angular shoulder 34 for holding one side of bit 28 Fig. 3 is an exploded view of the end portion of when the rod is screwed' down, the bit 28 being the tool as shown in Fig. 1. y pressed and held against abutments 2'I of Fig. 4 is a rear View, partly in section, of a shank 24.A y modied form of the invention. In Figs. 9 and 10 I show a further modified 20 Fig. 5 is a rbottom view, insection, of the end form of the invention wherein a tubular shank portion of the tool of Fig. 4. .e e 35 is provided with a bore 36 and a threaded por- Fig. 6 is an end view of thetool of Fig. 4.' l tion 3'I for a threadedlock screw 38. An angu- Fig. l is a sectional view taken along the line lar slot 39 is adapted to receive a boring bit 4@ 'I-'I of Fig. 5. and has an abutment portion 4I against which 25 Fig. 8 is a perspective view of the end portion the bit 4I) is held by pressure from a lock pin 42 of the lock'rod of Figs.4 'to 7. v in bore 36, which is tightened by a lock screw 38. Fig. 9 is a bottom view, in section, of a further Pin 42 is preferably provided with a tapered end modified form of the invention, and portion 43, the taper of whichcorresponds to the v Ill- ID of Fig. 9. From the foregoing description it will be ap]- Referringmore particularly `to the drawing, parent that I have provided improved, novel bor- I show a boring tool having tubular .shank II ing tools which are simple and inexpensive to having a bore I2 and provided with a slot I3 in manufacture, and adapted for interchangeability l one end thereof, there being a seat portion `I4 cut' of thev bits, and which may be readily assembled 35 at an angle at the end of slot I3. A locking rod and disassembled. In the forms shown in Figs. 5 is provided forvv a snug fit in borer I2 and has 1 to 8 it will be seen that the cutting edges of the a threaded portion I6 to receive a threaded lock bits are on the center line of the blo-ring tool which screw I1 which is adapted to draw the rod I5 to is advantageous, as isv obvious to those skilled, in

4o the left as seen in Fig. 1,"as lock screw II tightens the art. I 40 against the end of shank I I. Lock screw II may Having described my invention, what I claim is: be lmurledv or provided with apertures I8 for a A boring tool as described, comprising a'shank radial tightening tool. having a bore,` a bit slot in one end of said shank' yThe forward end of rod I5 is provided with a and having a shoulder, a lock-rod in said bore",

. 4.5l recess I9 extending to substantially the center adapted to press the tool bit against said shoulder, 45

y thereof, and an` angular shoulder 2li is formed at ascrew for moving said rod in the shank, said the forward end of this recess, against which a lock rod having av recess for a bit in one side, tool bit '2| is adapted to rest. A wedge block 22 and a wedge block within the recessrin the lock corresponding substantiallyto the shape of recess rod and conforming t0 the shape of the lock rod,

I9 is provided with an angular flange 23 which and said wedge block having an angular flange 5o rests against the side of toolv 2I `and against extending into the slot in the shank and adapted seat I4.` i l l to engage 'said bit, whereby the wedge block is Fig. 1 illustrates thefassembly of the tool, from maintained in the shank when the4 tool is` rewhich it will be clear that the bit 2l and block moved. f i 22 may be assembled in recess I9, the ends of bit LUCIAN S. SMITH. 55

2|v and` flange 23 extending through slot'l3', and l 

